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<TITLE>Z+Jets Inclusive Cross Section Analysis</TITLE>
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<IMG SRC = "ifae.gif"  width=100 ALT="IFAE-Barcelona"><br> 
<a href="http://www.ifae.es">IFAE-Barcelona</a> <br> 
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<strong>Authors</strong><br><br>
<strong>
Stefano Camarda (camarda@fnal.gov)</strong><br><br>
Monica D'Onofrio (donofrio@fnal.gov) <br><br>
Sebastian Grinstein (gris@fnal.gov) <br><br>
Mario Mart&iacute;nez (mmp@fnal.gov)<br><br>
Lorenzo Ortolan (loreorto@ifae.es) <br><br>
Veronica Sorin (vsorin@fnal.gov)

<br>
<br><address>
CDF, FNAL,  M.S. 318 <br> P.0. Box 500 <br> Batavia, Illinois 60510 <br> USA
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<center><strong>
Measurement of the Inclusive Jet Cross Sections in
<font
face="Times"><i>Z</i>/&gamma;<sup>*</sup>(&rarr;<i>&mu</i><sup>+</sup><i>&mu</i><sup>-</sup>)</font>+jets
Production
<br> (2.37 fb<sup>-1</sup> analysis)
</strong>
<br>

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<font size="4" color=0000dd>
<br>

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We present results on inclusive <font
face="Times"><i>Z</i>/&gamma;<sup>*</sup>(&rarr;<i>&mu</i><sup>+</sup><i>&mu</i><sup>-</sup>)</font>+jets
production in p-pbar collisions at &radic;<i>s</i> = 1.96 TeV using data collected with the upgraded
Collider Detector at Fermilab in Run II corresponding to an integrated luminosity of 2.37
fb<sup>-1</sup>. Jets are reconstructed using the Midpoint algorithm with <i>R</i>=0.7. Measurements
are performed as a function of jet transverse momentum and jet rapidity for jets with
<i>p</i><sub>T</sub><sup>jet</sup>&gt;30 GeV/<i>c</i> and |<i>y</i><sup>jet</sup>|&lt;2.1.
The measurements are corrected to the hadron level and compared to NLO pQCD predictions, the latter
including additional parton-to-hadron non-pQCD contributions.

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<dt>

<p>
<ul>

<br>
<br>
<font color=BLUE>
<li><strong> Blessed Results 2.37 fb<sup>-1</sup></strong>
</font>
<br>
<small>
The measurements are performed in the kinematic range defined as:
<ul>
<li> Two central muons ,  |&eta;<sup><i>&mu</i></sup>| &lt; 1.0
, with  <i>P</i><sub>T</sub> &gt; 25 GeV
<li> <i>Z</i> mass window:  66 &lt; <i>M<sub>&mu&mu</sub></i>  &lt; 116 GeV/<i>c</i><sup>2</sup> 

<li> &Delta;<i>R</i>(<i>&mu</i>,jet) &gt; 0.7 
</ul>
Jets are searched for using the MidPoint algorithm  with <i>R</i>=0.7. <br> 
Measurements are defined for hadron level jets with  <i>p</i><sub>T</sub><sup>jet</sup> &gt; 30
GeV/<i>c</i> and |<i>y</i><sup>jet</sup>| &lt; 2.1.
</small>
<br>
<br>
<ul>


<strong>
<li> Inclusive jet cross section in <font face="Times"><i>Z</i>/&gamma;<sup>*</sup></font>+&ge;1 jet
and <font face="Times"><i>Z</i>/&gamma;<sup>*</sup></font>+&ge;2 jets production as a function of
<i>p</i><sub>T</sub><sup>jet</sup>
</strong>

<br>
<small>
<i> Measured inclusive cross section for <font face="Times"><i>Z</i>/&gamma;<sup>*</sup></font>+jets
production as a function of <i>p</i><sub>T</sub><sup>jet</sup> compared to NLO pQCD predictions as
determined using MCFM. The pQCD prediction includes an additional <i>C</i><sub>had</sub> factor that
accounts for non-pQCD contributions. Systematic uncertainties on data and theoretical predictions are
included.</i><br>
<br>
<ul>

<li> Inclusive jet cross section in <font face="Times"><i>Z</i>/&gamma;<sup>*</sup></font>+&ge;1 jet
 <a href="figs/Pt1_Final.gif">gif</a> & <a
href="figs/Pt1_Final.eps">eps</a>
(Relative contributions to the total systematic uncertainty <a href="figs/Pt1_Syst.gif">gif</a> &
<a href="figs/Pt1_Syst.eps">eps</a>)

<li> Inclusive jet cross section in <font face="Times"><i>Z</i>/&gamma;<sup>*</sup></font>+&ge;2
jets  <a href="figs/Pt2_Final.gif">gif</a> & <a
href="figs/Pt2_Final.eps">eps</a>
(Relative contributions to the total systematic uncertainty <a href="figs/Pt2_Syst.gif">gif</a> &
<a href="figs/Pt2_Syst.eps">eps</a>)
</ul>
</small>



<br>
<br>
<br>
<strong>
<li> Total Inclusive Cross Section vs Inclusive Jet Multiplicity <a href="figs/NJ_Final.gif">gif</a> & <a
href="figs/NJ_Final.eps">eps</a> <br>
</strong>
<i>

<small>
Measured cross section as a function of inclusive jet multiplicity compared to NLO pQCD predictions
as determined using MCFM. In the ratio plot, data and NLO theory are referred to LO
predictions. Systematic uncertainties on data and theoretical predictions are included.
</small>
</i>

<br>
<br>
<br>


<strong>
<li> Inclusive jet cross section in <font face="Times"><i>Z</i>/&gamma;<sup>*</sup></font>+&ge;1 jet
and <font face="Times"><i>Z</i>/&gamma;<sup>*</sup></font>+&ge;2 jets production as a function of
|<i>y</i><sup>jet</sup>|
</strong>

<br>
<small>
<i> Measured inclusive cross section for <font face="Times"><i>Z</i>/&gamma;<sup>*</sup></font>+jets
production as a function of |y<sup>jet</sup>| compared to NLO pQCD predictions as determined using
MCFM. The pQCD prediction includes an additional C<sub>had</sub> factor that accounts for non-pQCD
contributions.
Systematic uncertainties on data and theoretical predictions are included.</i><br>
<br>
<ul>

<li> Inclusive jet cross section in <font face="Times"><i>Z</i>/&gamma;<sup>*</sup></font>+&ge;1 jet
<a href="figs/Y1_Final.gif">gif</a> & <a
href="figs/Y1_Final.eps">eps</a> (Relative contributions to the total systematic uncertainty <a
href="figs/Y1_Syst.gif">gif</a> & <a href="figs/Y1_Syst.eps">eps</a>)

<li> Inclusive jet cross section in <font face="Times"><i>Z</i>/&gamma;<sup>*</sup></font>+&ge;2
jets <a href="figs/Y2_Final.gif">gif</a> & <a
href="figs/Y2_Final.eps">eps</a> (Relative contributions to the total systematic uncertainty <a
href="figs/Y2_Syst.gif">gif</a> & <a href="figs/Y2_Syst.eps">eps</a>)
</ul>
</small>


<br>
<br>
<br>
<strong>
<li> <i>M<sub>&mu&mu</sub></i> mass distribution
</strong> <br>
<i>
<small>
Measured <i>M<sub>&mu&mu</sub></i> invariant mass distribution for data compared to the SM prediction  (only statistical uncertainties included) :</i>
<ul>
<li> in events with at least one jet  <a href="figs/ZMass1_RawXs.gif">gif</a> & <a href="figs/ZMass1_RawXs.eps">eps</a>.

<li> in events with at least two jets  <a href="figs/ZMass2_RawXs.gif">gif</a> & <a href="figs/ZMass2_RawXs.eps">eps</a>.
</ul>
</small>



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&nbsp &nbsp &nbsp &nbsp &nbsp &nbsp
Last modified by <strong> Stefano Camarda (camarda@fnal.gov)</strong> on
February 11, 2010</td>
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